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<?php $dateOld = new \DateTimeImmutable('2020-01-01'); echo $dateOld->modify("last day of last month")->format('Y-m-d'); echo PHP_EOL; echo $dateOld->modify("first day of next month")->format('Y-m-d');
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/qALa5
function name:  (null)
number of ops:  20
compiled vars:  !0 = $dateOld
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   NEW                                              $1      'DateTimeImmutable'
          1        SEND_VAL_EX                                              '2020-01-01'
          2        DO_FCALL                                      0          
          3        ASSIGN                                                   !0, $1
    5     4        INIT_METHOD_CALL                                         !0, 'modify'
          5        SEND_VAL_EX                                              'last+day+of+last+month'
          6        DO_FCALL                                      0  $4      
          7        INIT_METHOD_CALL                                         $4, 'format'
          8        SEND_VAL_EX                                              'Y-m-d'
          9        DO_FCALL                                      0  $5      
         10        ECHO                                                     $5
    6    11        ECHO                                                     '%0A'
    7    12        INIT_METHOD_CALL                                         !0, 'modify'
         13        SEND_VAL_EX                                              'first+day+of+next+month'
         14        DO_FCALL                                      0  $6      
         15        INIT_METHOD_CALL                                         $6, 'format'
         16        SEND_VAL_EX                                              'Y-m-d'
         17        DO_FCALL                                      0  $7      
         18        ECHO                                                     $7
         19      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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